@@ -57,8 +57,15 @@
 			end
 		end
 		return
 	end
+
+	local tmat = sorcery.itemclass.get(tool:get_name(),'material')
+	local wmat = sorcery.itemclass.get(wkpc:get_name(),'material')
+	-- obey level restrictions. TODO honor Rend
+	if (wmat and wmat.data.level or 0) > (tmat and (tmat.data.maxlevel or tmat.data.level) or 0) then
+		return
+	end
 
 	local tech = sorcery.lathe.tooltech(tool)
 	local rec = R[wkpc:get_name()][tech]
 	tech = sorcery.lathe.techs[tech]
@@ -165,13 +172,22 @@
 	on_metadata_inventory_put = sorcery.lathe.update;
 	on_metadata_inventory_take = function(pos, list, idx, stack, user)
 		if list == 'preview' then
 			local l = sorcery.lathe.get(pos,idx,stack:get_count())
-
 			if sorcery.lathe.techs[l.tech].consume then
 				l.tool:take_item(l.cost)
 			elseif sorcery.lathe.techs[l.tech].dmg then
-			--TODO wear down tool
+				local mat = sorcery.itemclass.get(l.tool,'material')
+				local mmat = sorcery.itemclass.get(l.wkpc,'metal')
+				local dur = 100
+				local lfac = 1
+				if mat then
+					local dur = mat.data.durability or dur
+					lfac = (mmat and mmat.data.level or 1) /
+						(mat.data.maxlevel or mat.data.level or 1)
+				end
+				local ch = 65535 / dur
+				l.tool:add_wear(4 * ch * l.cost * lfac)
 			end
 			l.wkpc:take_item(l.qty)
 			l.inv:set_stack('tool', 1, l.tool)
 			l.inv:set_stack('workpiece', 1, l.wkpc)